// Copyright (C) 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cst

import (
	"os"
	"path/filepath"
)

// Source represents a source file.
type Source struct {
	Filename string // The path which was used to load the source (if any).
	Runes    []rune // The full content of the source file.
}

// RelativeFilename returns the filename relative to the current working
// directory.
func (s Source) RelativeFilename() string {
	path := s.Filename
	if cwd, err := os.Getwd(); err == nil {
		if rel, err := filepath.Rel(cwd, s.Filename); err == nil {
			path = rel
		}
	}
	return path
}
